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package it.unitn.science.matr155863_148346_145963.bccstore.filter;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.apache.log4j.Logger;

/**
 *
 * @author berto
 */
public class AllPagesFLT implements Filter {
    
    private static final boolean debug = false;
    
    private static Logger log = Logger.getLogger(AllPagesFLT.class);
    
    // The filter configuration object we are associated with.  If
    // this value is null, this filter instance is not currently
    // configured. 
    private FilterConfig filterConfig = null;
    
    public AllPagesFLT() {
    }    
    
    private void doBeforeProcessing(RequestWrapper request, ResponseWrapper response)
            throws IOException, ServletException {
        if (debug) {
            log("AllPagesFLT:DoBeforeProcessing");
        }
    }    
    
    private void doAfterProcessing(RequestWrapper request, ResponseWrapper response)
            throws IOException, ServletException {
        if (debug) {
            log("AllPagesFLT:DoAfterProcessing");
        }
    }

    /**
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     * @param chain The filter chain we are processing
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain)
            throws IOException, ServletException {
        
        if (debug) {
            log("AllPagesFLT:doFilter()");
        }
        RequestWrapper wrappedRequest = new RequestWrapper((HttpServletRequest) request);
        ResponseWrapper wrappedResponse = new ResponseWrapper((HttpServletResponse) response);
        doBeforeProcessing(wrappedRequest, wrappedResponse);
        
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out=wrappedResponse.getResponse().getWriter();
        out.println("<html><head>");        
        //CSS
        out.println("<link rel=\"stylesheet\" href=\"" + wrappedRequest.getContextPath() + "/css/bccStyleSheet.css\" type=\"text/css\" title = \"bccStyleSheet\" />");
        out.println("<title>BCCStore</title>");
        out.println("</head>");
        try {        
            out.println("<body>");
            //Head
            out.println("<div id=\"bccStore_it\">");
            RequestDispatcher dispatcher =request.getRequestDispatcher("/contents/public/Head");
            dispatcher.include(request, response);
            //Main
            out.println("<div id=\"main\">");
                //LeftCol
                out.println("<div id=\"leftCol\">");
                dispatcher =request.getRequestDispatcher("/contents/public/LeftCol");
                dispatcher.include(request, response);
                out.println("</div>");
                
                out.println("<div id=\"contents\">");
                chain.doFilter(wrappedRequest, wrappedResponse);
                out.println("</div>");
            out.println("</div>");
            //Footer
            dispatcher =request.getRequestDispatcher("/contents/public/Footer");
            dispatcher.include(request, response);
            out.println("</div>");
        } catch (Throwable t) {
            // If an exception is thrown somewhere down the filter chain,
            // we still want to execute our after processing, and then
            // rethrow the problem after that.
            log.error(t);
            RequestDispatcher dispatcher=request.getRequestDispatcher("/contents/public/errorPage.html");
            dispatcher.include(request, response);
        }finally{
            doAfterProcessing(wrappedRequest, wrappedResponse);
            out.println("</body></html>");     
            out.close();
        }
        
    }
    
   
    /**
     * Return the filter configuration object for this filter.
     */
    public FilterConfig getFilterConfig() {
        return (this.filterConfig);
    }

    /**
     * Set the filter configuration object for this filter.
     *
     * @param filterConfig The filter configuration object
     */
    public void setFilterConfig(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }

    /**
     * Destroy method for this filter 
     */
    @Override
    public void destroy() {        
    }

    /**
     * Init method for this filter 
     */
    @Override
    public void init(FilterConfig filterConfig) {        
        this.filterConfig = filterConfig;
        if (filterConfig != null) {
            if (debug) {                
                log("AllPagesFLT: Initializing filter");
            }
        }
    }

    /**
     * Return a String representation of this object.
     */
    @Override
    public String toString() {
        if (filterConfig == null) {
            return ("AllPagesFLT()");
        }
        StringBuffer sb = new StringBuffer("AllPagesFLT(");
        sb.append(filterConfig);
        sb.append(")");
        return (sb.toString());
        
    }
    
    public static String getStackTrace(Throwable t) {
        String stackTrace = null;
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            t.printStackTrace(pw);
            pw.close();
            sw.close();
            stackTrace = sw.getBuffer().toString();
        } catch (Exception ex) {
        }
        return stackTrace;
    }
    
    public void log(String msg) {
        filterConfig.getServletContext().log(msg);        
    }

    /**
     * This request wrapper class extends the support class HttpServletRequestWrapper,
     * which implements all the methods in the HttpServletRequest interface, as
     * delegations to the wrapped request. 
     * You only need to override the methods that you need to change.
     * You can get access to the wrapped request using the method getRequest()
     */
    class RequestWrapper extends HttpServletRequestWrapper {
        
        public RequestWrapper(HttpServletRequest request) {
            super(request);
        }
        // You might, for example, wish to add a setParameter() method. To do this
        // you must also override the getParameter, getParameterValues, getParameterMap,
        // and getParameterNames methods.
        protected Hashtable localParams = null;
        
        public void setParameter(String name, String[] values) {
            if (debug) {
                System.out.println("AllPagesFLT::setParameter(" + name + "=" + values + ")" + " localParams = " + localParams);
            }
            
            if (localParams == null) {
                localParams = new Hashtable();
                // Copy the parameters from the underlying request.
                Map wrappedParams = getRequest().getParameterMap();
                Set keySet = wrappedParams.keySet();
                for (Iterator it = keySet.iterator(); it.hasNext();) {
                    Object key = it.next();
                    Object value = wrappedParams.get(key);
                    localParams.put(key, value);
                }
            }
            localParams.put(name, values);
        }
        
        @Override
        public String getParameter(String name) {
            if (debug) {
                System.out.println("AllPagesFLT::getParameter(" + name + ") localParams = " + localParams);
            }
            if (localParams == null) {
                return getRequest().getParameter(name);
            }
            Object val = localParams.get(name);
            if (val instanceof String) {
                return (String) val;
            }
            if (val instanceof String[]) {
                String[] values = (String[]) val;
                return values[0];
            }
            return (val == null ? null : val.toString());
        }
        
        @Override
        public String[] getParameterValues(String name) {
            if (debug) {
                System.out.println("AllPagesFLT::getParameterValues(" + name + ") localParams = " + localParams);
            }
            if (localParams == null) {
                return getRequest().getParameterValues(name);
            }
            return (String[]) localParams.get(name);
        }
        
        @Override
        public Enumeration getParameterNames() {
            if (debug) {
                System.out.println("AllPagesFLT::getParameterNames() localParams = " + localParams);
            }
            if (localParams == null) {
                return getRequest().getParameterNames();
            }
            return localParams.keys();
        }        
        
        @Override
        public Map getParameterMap() {
            if (debug) {
                System.out.println("AllPagesFLT::getParameterMap() localParams = " + localParams);
            }
            if (localParams == null) {
                return getRequest().getParameterMap();
            }
            return localParams;
        }
    }

    /**
     * This response wrapper class extends the support class HttpServletResponseWrapper,
     * which implements all the methods in the HttpServletResponse interface, as
     * delegations to the wrapped response. 
     * You only need to override the methods that you need to change.
     * You can get access to the wrapped response using the method getResponse()
     */
    class ResponseWrapper extends HttpServletResponseWrapper {
        
        public ResponseWrapper(HttpServletResponse response) {
            super(response);            
        }
        // You might, for example, wish to know what cookies were set on the response
        // as it went throught the filter chain. Since HttpServletRequest doesn't
        // have a get cookies method, we will need to store them locally as they
        // are being set.
	/*
        protected Vector cookies = null;
        
        // Create a new method that doesn't exist in HttpServletResponse
        public Enumeration getCookies() {
        if (cookies == null)
        cookies = new Vector();
        return cookies.elements();
        }
        
        // Override this method from HttpServletResponse to keep track
        // of cookies locally as well as in the wrapped response.
        public void addCookie (Cookie cookie) {
        if (cookies == null)
        cookies = new Vector();
        cookies.add(cookie);
        ((HttpServletResponse)getResponse()).addCookie(cookie);
        }
         */
    }
}
